Starting with API version 2026-01 of the GraphQL Admin API, your app can subscribe to the orders/link_requested webhook topic. This webhook is triggered when a customer requests a new order link from an expired Order status page, allowing your app to be notified when customers need access to their order details after the original link has expired.
This is a companion discussion topic for the original entry at https://shopify.dev/changelog/introducing-the-orderslinkrequested-webhook-topic